202 1 INS guide divides PVC into three grades, and the proportion of grade a PVC sheets is 1.5, which is brand-new. The specific gravity of grade B PVC sheet is 1.6, and appropriate fillers are added to the new material. The specific gravity of grade C PVC sheet is 1.6, which is a high-quality recycled material.

Polyvinyl chloride, abbreviated as PVC in English, is a polymer formed by polymerization of vinyl chloride monomer in peroxide, azo compounds and other initiators, or according to the mechanism of free radical polymerization under the action of light and heat. PVC is a white powder with amorphous structure, with low branching degree and poor stability to light and heat.